1877.| ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 231 
? BE. frondosus, id. ; ? Doris ramosa, Cantraine ; ? Idalia ramosa, 
Phil. ; Idalia crocea, id. 
Hab. Mediterranean, and south coast of England (Cornwall). 
9. Tropa yatesu, Angas, Journ. de Conch. xii. p. 60, pl. 5. f. 8 
(1864). 
Hab. New South Wales. 
Gen. THECACERA, Fleming, 1828. 
Body limaciform, smooth. Mantle obsolete; supracapital veil 
indistinct. Rhinophores laminated. No oral tentacles. Branchize 
non-retractile, with linear or tubercular lateral appendages. Odon- 
tophore broad, with 12-14 plates ; the two imner on each side bearing 
bicuspid spines; no central plate. Small lateral corneous jaws. 
a. Rhinophores with completely surrounding sheaths. 
1. T. virescens, Ald. & Hanc. Ann. & Mag. Nat. Hist. 2ud ser. 
viii. p. 290 (1851). 
Hab. 8. coast of England (Cornwall). 
2. T. caprrata, Ald. & Hanc. Mon. Br. Nud. Moll. p. 44, & 
Append. p. iv (1855). 
Hab. 8. coast of England (Cornwall). 
b. Rhinophores with partially surrounding sheaths. 
3. T. PENNIGERA, Fleming. 
Doris pennigera, Montagu, Trans. Linn. Soc. xi. p. 17, t. iv. 
f. 5 (1815). 
Polycera pennigera, Fleming. 
Hab. N. European coasts (England, France). 
Gen. Crimora, Alder & Hancock, 1862. 
Body limaciform. Mantle nearly obsolete, forming a supracapital 
veil with branched appendages, and a papillated ridge along each 
side of the back. Rhinophores laminated. Oral tentacles tubercular. 
Branchiz non-retractile, placed about two thirds down the centre of 
the back. Tail short, without a dorsal carina. Odontophore broad, 
bearing 26 or 27 spines on each side of three kinds; the innermost 
one is large, hooked, and bicuspid; the next 5 or 6 are short and 
obtuse, and supported on subquadrilateral plates; the rest very long, 
slender, and minutely denticulated on the inner margin. No central 
spine. 
C. papituata, Ald. & Hanc. Ann. & Mag. Nat. Hist. 3rd ser. x. 
p. 263 (1862). 
Hab. Guernsey. 
